Explanation

Starch has straight chain or amylose part of 200-2000,$1 \rightarrow 4\ \alpha - D$ pyranose glucose units and side chain or amylopectin part of 2000-200,000 glucose units that are attached to straight chains by $1 \rightarrow 6\alpha - D$ glycosidic linkages. Cellulose is the most abundant organic substance on earth. It has a molecular linear chain of 6000-10,000, 1-4 linked-$\beta$ pyranone glucose chain with molecular weight of 0.5-2.5 million. Adjacent glucose molecules lies at 180${^\circ}$ to each other.